Re: Soft power-on AT PSU

Posted on 2016-04-22, 13:10

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just to clear out any confusion, the red has +5V standby voltage, the black is 0V ground and the white has what voltage (when standby supply is on)? If white is near +5V, it means it should be pulled towards ground, usually below 0.8V to turn on, like with ATX supplies. If white is near 0V, it means …

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Re: Need help with a small issue regarding soldering in a new BIOS battery.

Posted on 2016-04-20, 20:54

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Lithium batteries are very sensitive to their charging. I am a bit worried putting Li-ion battery directly in place of a NiCd/NiMH, which in this era of motherboards are most likely just charged from the 5V through current limiting resistor and a diode. At least capacitors can survive the conditions …

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Re: Sound Blaster 16 Value ISA CT2770 recap

Posted on 2016-04-20, 20:28

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I know it's hard to see reason behind my intentions. Well, if it is a hobby, isn't that good enough reason :) About the supposedly wrong caps, yes, changing some of them with lower ESR can help with noise, and some don't, depending on what they do in the circuit. Changing some of them to larger …

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Re: Sound Blaster 16 Value ISA CT2770 recap

Posted on 2016-04-19, 19:05

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi there, I would like to ask for little help regarding my old Blaster. I know it's not the best one but it's all I'v got. I can hear quite a lot of noise. It subsides while lowering volume but it never entirely stops. I read here on many occassions that people were replacing caps to get better …

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Re: x86EMU emulator releases

Posted on 2016-04-18, 21:02

by

by Jepael

in Release Announcements

in Release Announcements

Well, using those lookup tables also generate a lot less quality audio (looking at the sine waves used). It might not be accurate when looking at the input and output, but it does generate better quality sound(as it uses pure sinusoidal signals instead of rounded values). Well, perhaps the tables …

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Re: Redneck Audio Mixer (Need advice)

Posted on 2016-04-13, 19:15

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Usually outputs are not meant to be connected together. It may not break immediately, but who knows what happens in the long run. It could sound distorted because the output is a relatively low impedance source that expects to see a relatively high impedance, but the other output looks like a low …

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Re: GUS Max Stereo?

Posted on 2016-04-09, 17:25

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I never really used GUS MAX myself, but it should be stereo on speaker out, so something is broken. Because both channels work on line out, it's got to be the power amp chip, or connector itself, or some component that the signal does not pass through. Or broken copper trace on PCB. Now, you need to …

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Re: Problem with CF boot in 486

Posted on 2016-04-04, 16:37

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It is usually best to partition and format drives in the machine it will be installed, because of differences in BIOS support for large drives. Large drives, greater than 1024*63*16 sectors (504 binary megabytes or 528 decimal megabytes) need geometry translation to be supported. If other machine …

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Re: LINUX QUESTION: ZORIN LINUX WON'T COPY EXE FILES TO MY WINDOWS MULTIBOOT FOLDERS

Posted on 2016-04-01, 19:32

by

by Jepael

in Milliways

in Milliways

I saw Linux move it and it showed up when I viewed it from within Linux. Next I pushed the reset button on my PC and booted to Windows XP. THE FILE WAS NOT THERE... Unfortunately i'm stuck with this piece of crap called Linux until Microsoft gets their act together and stops spying on everything we …

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Re: OPL3 in FPGA?

Posted on 2016-03-28, 00:06

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If it's largely based upon a software emulator I see no point to add another layer of emulation/simulation by building custom hardware - especially when the OPL3 is largely digital anyways. The algorithms are universal no matter if implemented with software or hardware. I personally have been …

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Re: Sound Blaster AWE32 CT3900 Ram sockets question..

Posted on 2016-03-27, 21:56

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

With more RAM you can load a bigger and better sounding soundfont to AWE wavetable synth.

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Re: Screen/gfx card issue

Posted on 2016-03-27, 19:56

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bit depth has nothing to do with this, but otherwise reducing refresh rate and/or resolution can help. The whole system (the monitor, the card, and the cable, including connectors along the way) must be able to support the required bandwith. The ghosting is definitely a sign of impedance mismatch, …

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Re: EMM386 causing games & apps to freeze?

Posted on 2016-03-27, 18:36

by

by Jepael

in DOS

in DOS

Aladdin may not work if there is too much EMS memory. Try giving it only 8MB of EMS memory. And there is no single configuration that could work with everything you throw at it, so back in the DOS era people usually had boot menus to select if they want XMS, EMS, CDROM or whatever configurations. …

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Re: Roland SC-88 repair

Posted on 2016-03-26, 21:50

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

mkay ... dump you uploaded differs then. Not necessarily. The screenshot is just displaying in word mode. So bytes within a word are swapped to make it human readable. If the bytes in the file are 0x53, 0x47, 0x36, 0x2D = "SG6-", which in words is 0x4753, 0x2D36, and if the letters are printed most …

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Re: Games with stereo PCM in SBPro but without SB16 support

Posted on 2016-03-26, 21:14

by

by Jepael

in DOS

in DOS

gdjacobs wrote: I thought Wolf3d used mixer panning Correct.

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Re: Roland SC-88 repair

Posted on 2016-03-26, 17:37

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Found this @ 13020h ....@B.@ -OSNU DaCvnsa- ........ Looks suspiciously like a scrambled "SOUND Canvas" You either selected a wrong ROM type or your rom might be partially bad (scrambling might be realized in hardware as a low level copy protection). What type did you select in your programmer? …

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Re: Roland SC-88 Pro voltage conversion

Posted on 2016-03-26, 12:29

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It is of course your responsibility to check the service manuals yourself, but from what I have understood, they only have sold the device with one universal transformer and the localisation is done through different mains cord assembly and soldering the mains input to correct voltage tap on the …

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Re: Need help fixing my Midiman Portman/S

Posted on 2016-03-26, 12:02

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, it looks like the series resistor of a zener shunt voltage regulator is blown. Either too much voltage was fed into the connector (it says +9VDC), or there has been some excess current draw or a short circuit after the regulation. It is impossible to say if there is still something else broken …

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Re: Roland SC-88 repair

Posted on 2016-03-25, 09:02

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Took a logic probe to some of the main board today most of the ic's I tested checked out but I did find some odd ones. What kind of logic probe is it? IC 16 and 21 were acting odd, using a logic probe on ic 16 pin 6 gave me a low pulse and on pin 2 its output; gave me just a low. according to what …

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Re: Optical drive on a 386, 486 and Pentium machines

Posted on 2016-03-23, 09:22

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

AFAIK your controller must support ATAPI. No, ATAPI is a protocol how to transfer data packets through ATA/IDE interface. An ISA bus ATA/IDE "controller" is nothing more but an address decoder and a buffer. So yes, most likely it will work on a single IDE interface, if you set hard drive as master, …

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